Quote:
Originally Posted by IanW
Couple of things: - The sheet thickness is almost certainly fine. See example below. However,
- Using a router to cut material will probably be challenging. As I understand it, the bit will tend to grab the material and yank it around with thin sheet. Granted, I don't personally have experience with this, but I've heard this said previously in other threads
- The sides are probably beefier than they need to be. Again, see example below
This past year my team and Team 1983 used a similar sheet metal design:
FRC 2374
FRC 1983
Both of these designs were from before kickoff and thus modified to address the challenges of the game.
Both teams only used one piece of sheet metal on the side panels, not a full box like you have. We then pop riveted the sheets to pieces of angle aluminum. Our rivets were on a 2" spacing. The chassis seemed to hold up quite well.
Good work though, good luck on your future iterations.
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Thanks for showing me the designs. There quite simplistic but look quite sturdy. Also I have done projects on the CNC with 0.050" sheet Aluminium and it just took some tuning with the spindle speed and feed rate.
Quote:
Originally Posted by rcmolloy
Yeah I would assume a 3/16" rivet every half inch should do you just fine. The current pattern seems to be way overkill.
Also, add some fillets to your pocketing patterns as well. It definitely helps the end mill for the router to eliminate the precise corners that you have going on there. Even more so, if you ran this, it will still have the mill's OD in each corner of your triangles. I would advise you make the fillets to your the mills exact OD or higher; never under.
Also, the normal/nominal thickness I have seen over the past years for sheet is a variance between .090" and 1/8". 1/8" for the beefier parts that require much of the static loads to be held and .090" for manipulation systems. (Correct me if I'm wrong guys haha)
Aside, it looks like a pretty decent sheet chassis.
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I have actually printed 2 Pieces from an old design of some front plates. They were merely a test but showed me i didn't need fillets on the sharp edges.
